3 ms·
> The instruction set is similar but not identical, and there's no exposed memory bus. Actually, there are a number of offerings in the coldfire v2/v3/v4family
by MisterTea 9y ago
> The instruction set is similar but not identical, and there's no exposed memory bus.
Actually, there are a number of offerings in the coldfire v2/v3/v4family with decent performance and external buses including PCI, 10/100 ethernet, USB, ATA, and CAN with DDR memory and parallel bus interface.
https://www.nxp.com/docs/en/data-sheet/MCF5307BUM.pdf https://www.nxp.com/docs/en/data-sheet/MCF5307BUM.pdf
https://www.nxp.com/docs/en/data-sheet/MCF54418.pdf https://www.nxp.com/docs/en/data-sheet/MCF54418.pdf
https://www.nxp.com/docs/en/data-sheet/MCF54455.pdf https://www.nxp.com/docs/en/data-sheet/MCF54455.pdf
- duskwuff 9y agoOh, the modern ones absolutely have other external busses -- but not a standard 68000 memory bus. There's no way to hook up an EEPROM with your program on it, for instance.
- MisterTea 9y agoI see what you are talking about. While the external bus interface on these cold fire parts is not a pin compatible m68k cpu bus, it certainly can access memory devices and uses DMA. From the 5307 manual: 1.3.7.1 External Bus Interface The bus interface controller transfers information between the ColdFire core or DMA and memory, peripherals, or other devices on the external bus.
- rjsw 9y agoI used one of the first generation dev boards, it had external DRAM and ROM.